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kconfig: Update IS_ENABLED() internals

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The config_enabled() macro currently uses 0 as the default value. Update
it to allow any value, so we can pass it something else, such as a
non-existent function, to produce a build error if it is not defined.

Also tidy up the code style for IS_ENABLED() and drop the unnecessary
brackets (the value is a simple 0 or 1).

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2022-01-22 05:07:25 -07:00
committed by Tom Rini
parent 93cb515fe3
commit 310bfa737f
1 changed files with 5 additions and 7 deletions
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12
include/linux/kconfig.h
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@@ -17,18 +17,16 @@
* the last step cherry picks the 2nd arg, we get a zero.
*/
#define __ARG_PLACEHOLDER_1 0,
#define config_enabled(cfg) _config_enabled(cfg)
#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
#define config_enabled(cfg, def_val) _config_enabled(cfg, def_val)
#define _config_enabled(value, def_val) __config_enabled(__ARG_PLACEHOLDER_##value, def_val)
#define __config_enabled(arg1_or_junk, def_val) ___config_enabled(arg1_or_junk 1, def_val)
#define ___config_enabled(__ignored, val, ...) val
/*
* IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y',
* 0 otherwise.
*
*/
#define IS_ENABLED(option) \
(config_enabled(option))
#define IS_ENABLED(option) config_enabled(option, 0)
/*
* U-Boot add-on: Helper macros to reference to different macros (prefixed by
@@ -76,7 +74,7 @@
#define __CONFIG_IS_ENABLED_1(option) __CONFIG_IS_ENABLED_3(option, (1), (0))
#define __CONFIG_IS_ENABLED_2(option, case1) __CONFIG_IS_ENABLED_3(option, case1, ())
#define __CONFIG_IS_ENABLED_3(option, case1, case0) \
__concat(__unwrap, config_enabled(CONFIG_VAL(option))) (case1, case0)
__concat(__unwrap, config_enabled(CONFIG_VAL(option), 0)) (case1, case0)
/*
* CONFIG_IS_ENABLED(FOO) expands to